Causes and Control of death of Young Pleurotus ostreatus

In the production of Pleurotus ostreatus, due to the discomfort of the environmental conditions and culture materials of the mushroom room, as well as improper management or disastrous weather, the phenomenon of shrinkage, yellowing and final death often occurs on the mushroom bed; sometimes, the small mushroom on the bed dies in batches, seriously affecting the yield and economic benefits. In this regard, the author has done a lot of observation and research, and summarized the causes and control methods of dead mushrooms, which are introduced as follows:

1 continuous high temperature in the production of autumn mushrooms in the northern region, the temperature is from high to low, which is suitable for the growth and development of the fruiting body of Pleurotus ostreatus, but sometimes in the middle of October to early November, when the second and third tide mushrooms are growing, a high temperature of more than 25 ℃ suddenly appears. If the high temperature prevention measures can not be taken in time, the small mushrooms on the mushroom bed will die if the temperature is above 22 ℃ for several consecutive days. In particular, young mushrooms the size of buttons will turn yellow, wither and die. In spring, the temperature of the mushroom room exceeds 21 ℃ for several consecutive days. If the mushroom room is poorly ventilated, the oxygen is insufficient, and the concentration of CO2 is too high, the heat generated in the metabolic process can not be released quickly, and a large number of small mushrooms will die. This is because the high temperature of the mushroom room is not suitable for the growth and development of the fruiting body, but it is suitable for the growth of the mycelium. Under the high temperature, the nutrition of the formed fruiting body will flow to the mycelium, and the small mushroom will wither and die due to lack of nutrition. In order to prevent the death of mushrooms at high temperature, we should pay attention to the weather forecast. when the high temperature occurs, the mushroom bed will immediately stop spraying water, open more doors and windows, and strengthen ventilation, so as to increase the indoor fresh air and improve the vitality of Pleurotus ostreatus; at the same time, cooling measures should be taken to make it no more than 21 ℃ to reduce dead mushrooms.

(2) the pH value of the culture material is not suitable for the growth of Pleurotus ostreatus. The suitable pH value for the growth of Pleurotus ostreatus is alkaline, and it is easy to die if the acid or alkalinity is too large. If the mushroom bud is brown with partial acid (pH value less than 5), the pH7.5; culture medium can be adjusted with 0.1% lime water and plant ash. If the pH value is above 8, the mushroom bud is yellow, and the pH can be adjusted to 7.3 with 0.1% calcium superphosphate solution.